Loans And Allowance For Loan Losses - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, impaired, interest lost on nonaccrual loans	$ 9,000,000	$ 12,000,000
Cash-basis interest income recognized	3,000,000	2,400,000
Financing receivable, change in method, credit loss expense (reversal)			$ 18,300,000
Transfers to held for sale			1,430,000,000
Financing receivable, allowance for credit loss	443,424,000	427,597,000	605,736,000	$ 281,402,000
Reserve for unfunded commitments	57,500,000
All financing receivable, allowance for credit loss	500,900,000	469,500,000
Provision for (reversal of) loan losses	$ 31,400,000
ACL to loans ratio	1.15%
Decrease in ACL to loans ratio	0.0004
Allowance for credit loss, reasonable and supportable forecast period	2 years
Allowance for credit loss, straight-line basis historical period	1 year
Modifications, post-modification recorded investment	$ 131,186,000	48,932,000	$ 76,615,000
Commitments to lend additional funds to TDRs		$ 0
Troubled Debt Restructuring That Subsequently Defaulted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subsequent default, number of contracts | contract	5,000	8	7
Modifications, post-modification recorded investment	$ 1,000,000	$ 978,000	$ 21,700,000
Baseline
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated unemployment rate	4.70%	4.40%
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		$ 41,900,000
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan substandard period (in days)	90 days
Loss And Charged Off
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retail loan charge off (in days)	120 days
Commercial And Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modifications, post-modification recorded investment	$ 105,610,000	27,618,000	$ 28,917,000
Commercial And Industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	14,700,000	399,600,000
Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 16,090,000,000.00	$ 14,190,000,000